Analysis of test questions: "Man is the measure of everything" became a famous saying because it had a great influence, which not only had an important influence at that time, but also shifted people's attention from nature to society. It also had a far-reaching impact on later generations and had a great impact on the Renaissance and other movements. Therefore, the question should choose item D.

Comments: The basic proposition of the school of the wise: (1) particularly emphasizes the value of human beings and puts forward the conclusion that "human beings are the yardstick of all things"; (2) Oppose superstition, emphasize freedom, and think that all systems, laws and morals are man-made products; (3) In terms of social morality, everyone should have their own judgment standards and should not be unified by force.